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PawCurve

Cat Age Calculator: How Old Is My Cat?

Your cat's life stage and how many more years it can expect — from a real life table, not from a chart the guideline bodies quietly deleted.

Sex

Life stage

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Expected further life
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Expected age reached
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Life expectancy at birth
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The life table: what cats at each age can still expect
If your cat is…Expected further lifeExpected age reachedAAHA/AAFP stage

Read down the last-but-one column: it rises. That isn't an error — it's how life tables work. Life expectancy at birth is averaged over every cat including those lost young; once your cat has got past that risk, its expected total climbs.

The chart that got deleted

The cat-age chart has a stranger story than the dog one, and it's worth five minutes of your time.

Unlike the dog version — which we couldn't trace to any document at all — the cat chart is genuinely published. It's right there in the 2010 AAFP/AAHA Feline Life Stage Guidelines, a full "Human equivalent" column: 12 months = 15, two years = 24, then +4 a year, all the way to 25 years = 116.

So far, so authoritative. Then you read where they got it:

"These guidelines follow a convenient life stage classification developed by the Feline Advisory Bureau and adopted in the recent AAFP Senior Care Guidelines."

The Feline Advisory Bureau is a cat charity — now International Cat Care. The chart came from a wellness programme called "WellCat for Life". Follow the trail back and it stops there: no study, no data, no derivation. The same 2010 document is candid about it, calling its own groupings "arbitrary demarcations along a spectrum, and not absolutes".

Then the 2021 revision deleted it. We downloaded the current AAHA/AAFP Feline Life Stage Guidelines and searched for "human year", "cat year", "human age", "human equivalent" and "conversion" —zero hits for every one. We audited the embedded images too, because the 2010 chart is a picture that no text search can see. It is genuinely gone. The 2021 guidelines define life stages and decline the conversion, exactly as their canine counterpart does.

So the position today: a convention a charity invented, that the professional bodies adopted for a decade and then dropped — while International Cat Care's own consumer pages still publish it, with no citations, even though its veterinary division co-authored the 2021 guidelines that removed it.

It might even be roughly right. That's not the point. Nobody has ever shown that it is, and a number nobody can justify shouldn't be the headline answer on a page you're trusting.

What we show instead, and why it's better

A life table beats an average, and the difference matters most for the cats people worry about — the old ones.

Ask most sites how long cats live and you'll get a single number. The real figure from Teng et al. (2024), a VetCompass study of 7,936 recorded cat deaths, is 11.74 years at birth. But that average is dragged down by every kitten lost early — and your cat isn't a newborn, it's alive in front of you.

Cat's age nowExpected further lifeExpected age reached
Newborn11.7 years11.7
5 years8.8 years13.8
10 years5.5 years15.5
12 years4.2 years16.2
15 years2.7 years17.7

Look at the right-hand column climbing. That is not a mistake, and it's the most useful thing on this page: a 12-year-old cat is expected to reach 16.2, not 11.7. Owners of older cats are routinely told an "average lifespan" that their cat has already passed, which reads as bad news and is simply the wrong statistic. Surviving buys expected life.

Frequently asked questions

How old is my cat in human years?
The honest answer is that nobody has ever shown their working for that conversion. The familiar chart — 15 human years at one, 24 at two, then +4 per year — was devised by a cat charity for a wellness programme, printed in the 2010 AAFP/AAHA Feline Life Stage Guidelines, and then removed from the 2021 revision. We searched the current guidelines for "human year", "cat year" and "human equivalent": zero hits. No study, no derivation, was ever published for the +4. So rather than repeat it, we show you life stage and how many more years your cat can expect — both of which come from real data.
How long do cats live?
Life expectancy at birth is 11.74 years — 12.51 for females and 11.18 for males — from Teng et al. (2024), a VetCompass study of 7,936 confirmed cat deaths in the UK. But an at-birth average is the wrong number for a cat that's already alive in front of you, because it's dragged down by cats lost young. Use the life table instead: a cat that has reached 12 can still expect 4.2 more years, taking it to about 16.
Why does my cat's expected age go UP as it gets older?
Because life expectancy is always conditional on having survived to today. At birth, the 11.74-year average includes every kitten lost early. Your cat has already dodged that. So at 5 it can expect 8.8 more years (13.8 total), at 10 it can expect 5.5 more (15.5 total), and at 15 it can expect 2.7 more (17.7 total). The number climbing isn't a bug — it's the single most useful thing a life table tells you, and it's exactly what gets lost when a site quotes you one "average lifespan".
When is a cat a senior?
The 2021 AAHA/AAFP Feline Life Stage Guidelines set four stages: kitten (birth to 1 year), young adult (1–6), mature adult (7–10) and senior (over 10). Note the 2021 revision simplified the older six-stage scheme — and that International Cat Care's consumer pages still run the old one. Senior is a cue to watch more closely, not a prognosis: a 12-year-old cat still has years of expected life ahead.
Which cat breeds live longest?
In the same study, Burmese (14.42 years) and Birman (14.39) topped the list; Sphynx (6.68) and Bengal (8.51) were the shortest-lived. Crossbred cats reached 11.89. Two cautions: several breeds rest on very few recorded deaths (Sphynx just 18), so those confidence intervals are wide; and purebred status itself was associated with 1.27 fewer years in the study's model.
Does neutering affect how long a cat lives?
In this study's later-life model, yes, and by more than you might guess: neutered cats lived 1.07 years longer on average. Being male cost 1.20 years, and being purebred 1.27 years. Weight mattered too — about 0.02 years lost per 100g away from ideal bodyweight. These are population associations from a multivariable model, not promises about your cat, and the neutering decision is one to make with your vet.
What data is this built on?
Teng KT, Brodbelt DC, Church DB, O'Neill DG (2024), "Life tables of annual life expectancy and risk factors for mortality in cats in the UK", Journal of Feline Medicine and Surgery 26(5), DOI 10.1177/1098612X241234556 — open access, VetCompass primary-care records, 7,936 confirmed deaths. Life stages come from the 2021 AAHA/AAFP Feline Life Stage Guidelines. One caveat we'll state plainly: this is a UK population, and 7,936 is a count of deaths, not a population — it's a smaller evidence base than the 584,734-dog study behind our dog calculator.

Related

Sources last checked 2026-07-17. Life tables: Teng KT, Brodbelt DC, Church DB, O'Neill DG (2024), J Feline Med Surg 26(5), DOI 10.1177/1098612X241234556 — VetCompass UK, 7,936 confirmed deaths, a UK population. Life stages: 2021 AAHA/AAFP Feline Life Stage Guidelines. Full detail on our methodology page.